This course will teach you about behavioral design patterns and their implementation in modern C++. It covers the Observer, State, Stategy, Template Method, and Visitor patterns.The correct application and recognition of design patterns is an important skill for developers and architects. This course, Design Patterns in C++: Behavioral - Observer to Visitor, part of a multi-series course on C++ patterns, continues to introduce the viewer to Behavioral design patterns. It covers the Observer, State, Stategy, Template Method, and Visitor patterns, showing different ways in which these patterns can be implemented in modern C++ (C++ 11 and beyond). Software required: a C++ IDE (e.g., Visual Studio, CLion) or a text editor (e.g., VIM, EMACS) together with a C++ compiler (e.g., GCC, Clang).